mirror of https://github.com/aria2/aria2
128 lines
3.8 KiB
C++
128 lines
3.8 KiB
C++
/* <!-- copyright */
|
|
/*
|
|
* aria2 - The high speed download utility
|
|
*
|
|
* Copyright (C) 2006 Tatsuhiro Tsujikawa
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* In addition, as a special exception, the copyright holders give
|
|
* permission to link the code of portions of this program with the
|
|
* OpenSSL library under certain conditions as described in each
|
|
* individual source file, and distribute linked combinations
|
|
* including the two.
|
|
* You must obey the GNU General Public License in all respects
|
|
* for all of the code used other than OpenSSL. If you modify
|
|
* file(s) with this exception, you may extend this exception to your
|
|
* version of the file(s), but you are not obligated to do so. If you
|
|
* do not wish to do so, delete this exception statement from your
|
|
* version. If you delete this exception statement from all source
|
|
* files in the program, then also delete it here.
|
|
*/
|
|
/* copyright --> */
|
|
#include "SimpleRandomizer.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <cstdlib>
|
|
#include <cassert>
|
|
#include <cstring>
|
|
|
|
#include "a2time.h"
|
|
#include "a2functional.h"
|
|
#include "LogFactory.h"
|
|
#include "fmt.h"
|
|
|
|
#ifdef HAVE_GETRANDOM_INTERFACE
|
|
#include <errno.h>
|
|
#include <linux/errno.h>
|
|
#include "getrandom_linux.h"
|
|
#endif
|
|
|
|
namespace aria2 {
|
|
|
|
std::unique_ptr<SimpleRandomizer> SimpleRandomizer::randomizer_;
|
|
|
|
const std::unique_ptr<SimpleRandomizer>& SimpleRandomizer::getInstance()
|
|
{
|
|
if (!randomizer_) {
|
|
randomizer_.reset(new SimpleRandomizer());
|
|
}
|
|
return randomizer_;
|
|
}
|
|
|
|
namespace {
|
|
std::random_device rd;
|
|
} // namespace
|
|
|
|
#ifdef __MINGW32__
|
|
SimpleRandomizer::SimpleRandomizer()
|
|
{
|
|
BOOL r = ::CryptAcquireContext(&provider_, 0, 0, PROV_RSA_FULL,
|
|
CRYPT_VERIFYCONTEXT | CRYPT_SILENT);
|
|
assert(r);
|
|
}
|
|
#else // !__MINGW32__
|
|
SimpleRandomizer::SimpleRandomizer() : gen_(rd()) {}
|
|
#endif // !__MINGW32__
|
|
|
|
SimpleRandomizer::~SimpleRandomizer()
|
|
{
|
|
#ifdef __MINGW32__
|
|
CryptReleaseContext(provider_, 0);
|
|
#endif
|
|
}
|
|
|
|
long int SimpleRandomizer::getRandomNumber(long int to)
|
|
{
|
|
assert(to > 0);
|
|
return std::uniform_int_distribution<long int>(0, to - 1)(*this);
|
|
}
|
|
|
|
void SimpleRandomizer::getRandomBytes(unsigned char* buf, size_t len)
|
|
{
|
|
#ifdef __MINGW32__
|
|
BOOL r = CryptGenRandom(provider_, len, reinterpret_cast<BYTE*>(buf));
|
|
assert(r);
|
|
#else // ! __MINGW32__
|
|
#if defined(HAVE_GETRANDOM_INTERFACE)
|
|
static bool have_random_support = true;
|
|
if (have_random_support) {
|
|
auto rv = getrandom_linux(buf, len);
|
|
if (rv != -1) {
|
|
// getrandom is not supposed to fail, ever, so, we want to assert here.
|
|
assert(rv >= 0 && (size_t)rv == len);
|
|
return;
|
|
}
|
|
have_random_support = false;
|
|
A2_LOG_INFO("Disabled getrandom support, because kernel does not "
|
|
"implement this feature (ENOSYS)");
|
|
}
|
|
// Fall through to generic implementation
|
|
#endif // defined(HAVE_GETRANDOM_INTERFACE)
|
|
auto ubuf = reinterpret_cast<result_type*>(buf);
|
|
size_t q = len / sizeof(result_type);
|
|
auto dis = std::uniform_int_distribution<result_type>();
|
|
for (; q > 0; --q, ++ubuf) {
|
|
*ubuf = dis(gen_);
|
|
}
|
|
const size_t r = len % sizeof(result_type);
|
|
auto last = dis(gen_);
|
|
memcpy(ubuf, &last, r);
|
|
#endif // ! __MINGW32__
|
|
}
|
|
|
|
} // namespace aria2
|